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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 25, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Asset Acquisition [Line Items]        
Financing Receivables   $ 1,220.2 $ 817.2  
Financing receivables progress payments   403.0 $ 665.1 $ 0.0
Natural Gas-To-Syngas Processing Facility        
Asset Acquisition [Line Items]        
Price of acquisition $ 1,000.0      
Term of project agreement 15 years      
Financing Receivables   920.0    
Financing receivables progress payments   $ 120.0